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From: Baoquan He <bhe@redhat.com>
To: kasan-dev@googlegroups.com
Cc: linux-mm@kvack.org, andreyknvl@gmail.com, ryabinin.a.a@gmail.com,
	glider@google.com, dvyukov@google.com,
	linux-kernel@vger.kernel.org, linux-um@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev,
	linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org,
	x86@kernel.org, chris@zankel.net, jcmvbkbc@gmail.com,
	linux-s390@vger.kernel.org, hca@linux.ibm.com,
	Baoquan He <bhe@redhat.com>
Subject: [PATCH v5 09/15] arch/powerpc: don't initialize kasan if it's disabled
Date: Wed, 25 Feb 2026 16:14:06 +0800	[thread overview]
Message-ID: <20260225081412.76502-10-bhe@redhat.com> (raw)
In-Reply-To: <20260225081412.76502-1-bhe@redhat.com>

Here, kasan is disabled if specified 'kasan=off' in kernel cmdline.

This includes 32bit, book3s/64 and book3e/64.

Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: linuxppc-dev@lists.ozlabs.org
---
 arch/powerpc/mm/kasan/init_32.c        | 6 +++++-
 arch/powerpc/mm/kasan/init_book3e_64.c | 4 ++++
 arch/powerpc/mm/kasan/init_book3s_64.c | 4 ++++
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/kasan/init_32.c b/arch/powerpc/mm/kasan/init_32.c
index 1d083597464f..0ea2a636c992 100644
--- a/arch/powerpc/mm/kasan/init_32.c
+++ b/arch/powerpc/mm/kasan/init_32.c
@@ -141,6 +141,10 @@ void __init kasan_init(void)
 	u64 i;
 	int ret;
 
+	/* If KASAN is disabled via command line, don't initialize it. */
+	if (kasan_arg_disabled)
+		return;
+
 	for_each_mem_range(i, &base, &end) {
 		phys_addr_t top = min(end, total_lowmem);
 
@@ -170,7 +174,7 @@ void __init kasan_init(void)
 
 void __init kasan_late_init(void)
 {
-	if (IS_ENABLED(CONFIG_KASAN_VMALLOC))
+	if (IS_ENABLED(CONFIG_KASAN_VMALLOC) && kasan_enabled())
 		kasan_unmap_early_shadow_vmalloc();
 }
 
diff --git a/arch/powerpc/mm/kasan/init_book3e_64.c b/arch/powerpc/mm/kasan/init_book3e_64.c
index 0d3a73d6d4b0..fbe4c9a7e460 100644
--- a/arch/powerpc/mm/kasan/init_book3e_64.c
+++ b/arch/powerpc/mm/kasan/init_book3e_64.c
@@ -111,6 +111,10 @@ void __init kasan_init(void)
 	u64 i;
 	pte_t zero_pte = pfn_pte(virt_to_pfn(kasan_early_shadow_page), PAGE_KERNEL_RO);
 
+	/* If KASAN is disabled via command line, don't initialize it. */
+	if (kasan_arg_disabled)
+		return;
+
 	for_each_mem_range(i, &start, &end)
 		kasan_init_phys_region(phys_to_virt(start), phys_to_virt(end));
 
diff --git a/arch/powerpc/mm/kasan/init_book3s_64.c b/arch/powerpc/mm/kasan/init_book3s_64.c
index dcafa641804c..f7906f9ef9be 100644
--- a/arch/powerpc/mm/kasan/init_book3s_64.c
+++ b/arch/powerpc/mm/kasan/init_book3s_64.c
@@ -54,6 +54,10 @@ void __init kasan_init(void)
 	u64 i;
 	pte_t zero_pte = pfn_pte(virt_to_pfn(kasan_early_shadow_page), PAGE_KERNEL);
 
+	/* If KASAN is disabled via command line, don't initialize it. */
+	if (kasan_arg_disabled)
+		return;
+
 	if (!early_radix_enabled()) {
 		pr_warn("KASAN not enabled as it requires radix!");
 		return;
-- 
2.52.0



WARNING: multiple messages have this Message-ID (diff)
From: Baoquan He <bhe@redhat.com>
To: kasan-dev@googlegroups.com
Cc: linux-mm@kvack.org, andreyknvl@gmail.com, ryabinin.a.a@gmail.com,
	glider@google.com, dvyukov@google.com,
	linux-kernel@vger.kernel.org, linux-um@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev,
	linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org,
	x86@kernel.org, chris@zankel.net, jcmvbkbc@gmail.com,
	linux-s390@vger.kernel.org, hca@linux.ibm.com,
	Baoquan He <bhe@redhat.com>
Subject: [PATCH v5 09/15] arch/powerpc: don't initialize kasan if it's disabled
Date: Wed, 25 Feb 2026 16:14:06 +0800	[thread overview]
Message-ID: <20260225081412.76502-10-bhe@redhat.com> (raw)
In-Reply-To: <20260225081412.76502-1-bhe@redhat.com>

Here, kasan is disabled if specified 'kasan=off' in kernel cmdline.

This includes 32bit, book3s/64 and book3e/64.

Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: linuxppc-dev@lists.ozlabs.org
---
 arch/powerpc/mm/kasan/init_32.c        | 6 +++++-
 arch/powerpc/mm/kasan/init_book3e_64.c | 4 ++++
 arch/powerpc/mm/kasan/init_book3s_64.c | 4 ++++
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/kasan/init_32.c b/arch/powerpc/mm/kasan/init_32.c
index 1d083597464f..0ea2a636c992 100644
--- a/arch/powerpc/mm/kasan/init_32.c
+++ b/arch/powerpc/mm/kasan/init_32.c
@@ -141,6 +141,10 @@ void __init kasan_init(void)
 	u64 i;
 	int ret;
 
+	/* If KASAN is disabled via command line, don't initialize it. */
+	if (kasan_arg_disabled)
+		return;
+
 	for_each_mem_range(i, &base, &end) {
 		phys_addr_t top = min(end, total_lowmem);
 
@@ -170,7 +174,7 @@ void __init kasan_init(void)
 
 void __init kasan_late_init(void)
 {
-	if (IS_ENABLED(CONFIG_KASAN_VMALLOC))
+	if (IS_ENABLED(CONFIG_KASAN_VMALLOC) && kasan_enabled())
 		kasan_unmap_early_shadow_vmalloc();
 }
 
diff --git a/arch/powerpc/mm/kasan/init_book3e_64.c b/arch/powerpc/mm/kasan/init_book3e_64.c
index 0d3a73d6d4b0..fbe4c9a7e460 100644
--- a/arch/powerpc/mm/kasan/init_book3e_64.c
+++ b/arch/powerpc/mm/kasan/init_book3e_64.c
@@ -111,6 +111,10 @@ void __init kasan_init(void)
 	u64 i;
 	pte_t zero_pte = pfn_pte(virt_to_pfn(kasan_early_shadow_page), PAGE_KERNEL_RO);
 
+	/* If KASAN is disabled via command line, don't initialize it. */
+	if (kasan_arg_disabled)
+		return;
+
 	for_each_mem_range(i, &start, &end)
 		kasan_init_phys_region(phys_to_virt(start), phys_to_virt(end));
 
diff --git a/arch/powerpc/mm/kasan/init_book3s_64.c b/arch/powerpc/mm/kasan/init_book3s_64.c
index dcafa641804c..f7906f9ef9be 100644
--- a/arch/powerpc/mm/kasan/init_book3s_64.c
+++ b/arch/powerpc/mm/kasan/init_book3s_64.c
@@ -54,6 +54,10 @@ void __init kasan_init(void)
 	u64 i;
 	pte_t zero_pte = pfn_pte(virt_to_pfn(kasan_early_shadow_page), PAGE_KERNEL);
 
+	/* If KASAN is disabled via command line, don't initialize it. */
+	if (kasan_arg_disabled)
+		return;
+
 	if (!early_radix_enabled()) {
 		pr_warn("KASAN not enabled as it requires radix!");
 		return;
-- 
2.52.0


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  parent reply	other threads:[~2026-02-25  8:16 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-02-25  8:13 [PATCH v5 00/15] mm/kasan: make kasan=on|off work for all three modes Baoquan He
2026-02-25  8:13 ` Baoquan He
2026-02-25  8:13 ` [PATCH v5 01/15] mm/kasan: add conditional checks in functions to return directly if kasan is disabled Baoquan He
2026-02-25  8:13   ` Baoquan He
2026-02-25  8:13 ` [PATCH v5 02/15] mm/kasan: rename 'kasan_arg' to 'kasan_arg_disabled' Baoquan He
2026-02-25  8:13   ` Baoquan He
2026-02-25  8:14 ` [PATCH v5 03/15] mm/kasan: mm/kasan: move kasan= code to common place Baoquan He
2026-02-25  8:14   ` Baoquan He
2026-02-25  8:14 ` [PATCH v5 04/15] mm/kasan: make kasan=on|off take effect for all three modes Baoquan He
2026-02-25  8:14   ` Baoquan He
2026-02-25  8:14 ` [PATCH v5 05/15] mm/kasan/sw_tags: don't initialize kasan if it's disabled Baoquan He
2026-02-25  8:14   ` Baoquan He
2026-02-25  8:14 ` [PATCH v5 06/15] arch/arm: " Baoquan He
2026-02-25  8:14   ` Baoquan He
2026-02-25  8:14 ` [PATCH v5 07/15] arch/arm64: " Baoquan He
2026-02-25  8:14   ` Baoquan He
2026-02-25  8:14 ` [PATCH v5 08/15] arch/loongarch: " Baoquan He
2026-02-25  8:14   ` Baoquan He
2026-02-25  8:14 ` Baoquan He [this message]
2026-02-25  8:14   ` [PATCH v5 09/15] arch/powerpc: " Baoquan He
2026-03-12 11:12   ` Sourabh Jain
2026-03-12 11:12     ` Sourabh Jain
2026-03-12 11:23     ` Christophe Leroy (CS GROUP)
2026-03-12 11:23       ` Christophe Leroy (CS GROUP)
2026-03-17  2:10       ` Baoquan He
2026-03-17  2:10         ` Baoquan He
2026-03-17  2:39       ` Sourabh Jain
2026-03-17  2:39         ` Sourabh Jain
2026-02-25  8:14 ` [PATCH v5 10/15] arch/riscv: " Baoquan He
2026-02-25  8:14   ` Baoquan He
2026-02-25  8:14 ` [PATCH v5 11/15] arch/x86: " Baoquan He
2026-02-25  8:14   ` Baoquan He
2026-02-25  8:14 ` [PATCH v5 12/15] arch/xtensa: " Baoquan He
2026-02-25  8:14   ` Baoquan He
2026-02-25  8:14 ` [PATCH v5 13/15] arch/um: " Baoquan He
2026-02-25  8:14   ` Baoquan He
2026-02-25  8:14 ` [PATCH v5 14/15] mm/kasan: add document into kernel-parameters.txt Baoquan He
2026-02-25  8:14   ` Baoquan He
2026-03-12 12:53   ` Samuel Holland
2026-03-12 12:53     ` Samuel Holland
2026-03-17  3:36     ` Baoquan He
2026-03-17  3:36       ` Baoquan He
2026-03-17  3:49       ` Samuel Holland
2026-03-17  3:49         ` Samuel Holland
2026-02-25  8:14 ` [PATCH v5 15/15] mm/kasan: clean up unneeded ARCH_DEFER_KASAN and kasan_arch_is_ready Baoquan He
2026-02-25  8:14   ` Baoquan He

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